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Well there are 467 moves in the soul silver and there are 24 moves that metronome cant use so since metronome randomly uses a move, it is 1/(467-24) = 1/443 which is about a .23% chance.
Legendary signature moves do not make a difference when considering metronome nor is any other really powerful move. A move like spacial rend has the same chance of appearing as a move like splash.
Sources:
-http://bulbapedia.bulbagarden.net/wiki/Metronome_(move)
-http://www.serebii.net/attackdex-dp/